Random distributed Rayleigh feedback fiber laser based on double-cladding weak ytterbium-doped fiber
A technology of fiber lasers and ytterbium-doped fibers, which is applied in lasers, laser components, phonon exciters, etc., can solve the problems that a single fiber cannot provide distributed active gain and random distributed Rayleigh feedback at the same time, and achieve the suppression Effects of non-linear effects, reduced requirements, lower lasing threshold
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Embodiment 1
[0058] A randomly distributed Rayleigh feedback fiber laser based on a double-clad weakly doped ytterbium fiber, including a pump laser source 1, a pump beam combiner 2 and a cladding power stripper 4, including for simultaneously realizing distributed active gain and The double-clad weakly doped ytterbium fiber 3 with randomly distributed Rayleigh feedback, the output end of the pump combiner 2 is connected to one end of the double-clad weakly doped ytterbium fiber 3, and the other end of the double-clad weakly doped ytterbium fiber 3 is connected to the cladding The input end of the layer power stripper 4 is connected, and the double-clad weakly doped ytterbium fiber 3 includes an outer cladding composed of pure silicate, an inner cladding of germanium silicate doped with a certain concentration of germanium ions, and the fiber Core, the core consists of germanosilicate doped with a low concentration of ytterbium ions, the concentration of ytterbium ions is 8x10 23 / m 3 , l...
Embodiment 2
[0060] Based on embodiment 1, it also includes FBG5 for enhancing laser feedback, and FBG5 is connected to the pump beam combiner 2 signal end; the structure is as figure 2 shown;
[0061] The concentration of ytterbium ions in double-clad weakly doped ytterbium fiber 3 is 8x10 23 / m 3 The pump laser source 1 is 976nm, the length of FBG5 is 1040nm, and the length of double-clad weakly doped ytterbium fiber 3 is 210m; FBG5 of 1040nm has high reflectivity and low transmittance to 1040nm light; the FBG is set to form a semi-open cavity structure, which enhances The feedback of the laser and the narrow line width of the FBG have a narrowing effect on the laser, thereby achieving a high-power random laser output with a lower threshold and narrower line width. Such as image 3 As shown, as the pump power increases, the laser power also increases continuously, such as Figure 4 The random fiber laser shown is the distribution of laser power along the longitudinal direction of th...
Embodiment 3
[0063] On the basis of Example 2, the pump laser source 1 is selected to be 976nm, the length of the double-clad weakly doped ytterbium fiber 3 is selected to be 170m, and the length of the FBG5 is selected to be 1060nm; the lasing efficiency of random fiber lasers in the 1060nm band can be greatly improved.
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